Reversing-valve



`H. rijsHlLn.` y REVERSING VALVE.

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R.EVERSING VALVE.

ALPPLIQATIQN FILED Aus. 19. 191s.

INVENTOR Patented Feb. 24,1920.

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UNITED STATES PATENT OFFICE.

HERMANN E. SCHILD, 0F PITTSBURGH, PENNSYLVANIA, ASSIG-NOR OF ONE-HALF TO S. R. SMYTHE COMPANY, INC., OF PITTSBURGH, PENNSYLVANIA, A CORPORATION 0F WEST VIRGINIA.

REVERSINGr-VALVE.

Specication of Letters Patent.

Patented Feb. 24, 1920.

ToiaiZZ 'whom 'it may concern:

Be it known that I, HERMANN E. SCHILD, a resident of Pittsburgh, in the county of vAllegheny and State of Pennsylvania, have invented a new and useful Improvement 1n Reversing-Valves, of which the following is a specification.

This invention relates to reversing valves for regenerating and similar furnaces, such as Siemens open hearth furnaces, and similar-types of refining and heating furnaces. The object of the invention is to provide a valve for reversing either the air or gas of which is of simple construction, easy to operate, and which when used for reversing the gas prevents wasting the gas and avoids danger ,of explosions, and to provide a valve which is especially adapted for gas and air ports opening from below so as to avoid overhead conduits.

As is well known, regenerating furnaces are provided with four regenerators or heating chambers for the air and gas, two for the air and two for the gas. Each of these chambers is filled with lire lbrick or other refractory material, known as checker work7 which, upon becoming heated, serves as a means for heating the air or gas passing through the same and before entering thefurnace chamber. The air and gas are separately conducted, each through a previously heated regeneratorchamber, where they become heated and thence pass to the furnace chamber, and the waste products of combustion pass to the stack through the two remaining regenerator chambers and heat the checker work in the latter, thereby themselves becomingy cooled. The first named set of regenerator chambers gradually cools ofi and after al certain time it is necessary to reverse the course of the air and gas, so that the same will then enter through the newly heated regenerator chambers, and thence to the furnace chamber, while the waste products of combustion pass out through the regenerators first used, thus reheating the same, and so on alternately.

Various forms of valves have heretofore been provided and suggested for reversing the air and gas, such as butterfly valves and dome-shaped valves mounted either to reciprocate or oscillate. All prior` forms of valves have, however, been somewhat complicated and diilicult to repair or inspect,

and most of them have also been so constructed that they are not adapted to ports opening from below and also so that when reversing there was more or less wastage of gas.

The object of my invention is to provide a reversing valve ofl simple construction and which is particularly adapted for flues opening from below. The invention comprises a valve mechanism constructed and operating as hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a plan view of the valve mechanism, with the Valves in horizontal section and showing diagrammatically the checker chambers and connecting fines; Fig. :2 is a similar View showing one ,of the valves in plan and the other valve seat in plan; and Fig. 3 is a vertical sectional view on the line 3 3, Fig. 1.

In the drawings, the reference numerals 1, 1a, indicate diagrammatically the checker chambers for the gas and 2 and 2"* the checker chambers for the air. The chambers 1, 1l are connected by passages 3 and 3a to ports 4 and 4 in the valve seats 5 and 5 while the air chambers 2 and 2a are connected by passages 6 and 6a to ports 7 and 7a in a valve seat 8. In the valve seats 5 and 5 are a pair of gas ports 9 and 9a connected respectively to the gas mains 10 and 10a, and also a pair of ports 11 and 11fL connected by passages 12, 121 and 13 to the stack, not shown. The valve seat 8 is likewise provided with a port 14C connected by passage 15 to the stack. All of the valve seats named are fiat and horizontal and the ports enter through the same from below.

The gas reversing valve comprises a pair of members provided with flat bottom faces tting and sliding on the lseats 5 and 5^ and which members may be in the form of plates but preferably in the form of water pans 16, 162L of sufficient size to cover all of the three ports in the valve seats in all `operative positions of the valve. These members 16, 16FL are mounted to oscillate about the regenerator ports at and 4a and to this end the valve seats at the regenerator ports are provided with annular recesses 17, and the plates or pans 16, 16L are provided with downwardly projecting annular flanges 1S fitting into said recess and forming the pivot for said members 16, 16a. These members carry dome-shaped valve members 19, 19,

preferably lined with refractory material and with the edges thereof dipping below the surfacerof the water in the pans, and which dome-shaped members are provided with chambers or passages 20, L of such length as to connect the regenerator port with either the gas port or stack port, which two lat-ter ports are located equidistant from the regenerator port so that said passages direct the gas and products of combustion in the manner hereinafter described.

The valves described have a simple rotary or oscillatory movement back and forth in a horizontal plane on the valve seats 5 and i. In one of the positions of the valves the dome-shaped member 19 is in position to connect Oas ort 9 with reo'enerator Jort 1l thus directing the gas intogthe' checker chamber 1, with the left hand side of the water panA 16 covering the vstack por-t 11, while the other dome-shaped member 19 connects the regenerator port la with stack port l1a and with the left'hand extension of the water pan 16n covering the gas port 9u. Consequently the gas now enters the checker chamber 1 and is heated therein and thence goes to the furnace chamber, while the products of combustion pass through the checker chamber 'la and through the other valve member and thence to the stack. To reverse the lgas the valves are merely moved toward the left so that the dome-shaped member 19 then connects regenerator port 4 with stack port 11, while the right hand extension of the pan 16 covers the gas port 9, and the dome-shaped member 19L connec'ts regenerator port 4t with the gas port 9a, and the right hand extension of the pan 16a ycovers the stack port 11a.

Any suitable mechanism may be used for reversing the positions of the two valve members in unison. As shown, the two plates or pans 16 and 16a are provided with toothed edge portions 22, 22a, which are in elfect segments of worm gears, concentric with the aX'es of oscillation of said plates or pans, and which toothed portions are engaged by worms Q3, 23a, on opposite ends of the shaft 24 which is driven through suitable reducing gearing 25 from a reversing electric motor Q6.` By this means the two Yvalve members are moved in unison, in either direction, to effect the different port connections above described. It is obvious, however, that various other forms of mechanism for moving thevalve members may be i employed.

The valve mechanism described can be used for reversing not only the gas, but, if desired, can also be used for reversing the Y air flowing to the furnaces. To effect this,

relations to each it would only be necessary to arrange the ports 7 7a, and 14, in the same positional other as the portsll, 9 and 11, and use a valve member exactly as that Ydescribed except that the` plate or Vwater pan need not be extended so -as to cover the third port. Y A v Y The valve mechanism described is very simple and requires only slight power to reverse it. It is admirably adapted to ports opening from below, and since the valve seats areiat and the valve members thereon have corresponding fiat under surfaces and need not be lifted in passing from one position to the other, there is little danger of' leakage of gas. vThe watercooling of the valve prevents warping .and burning of the valves and valve seats vso that a practical gas-tight it of the valves on their seats canV be maintained.' All of the parts are exposed so that they can be readily inspected and also readily gotten at for repair when necessary'. Y

VIclaiin: v Y Y 1. In reversing valve mechanism, the combination of a horizontal valve seat provided with three ports opening from below, a horizontally oscillating valve resting on and cooperating with said seat and provided with a passage arranged in all positions of-the valve to communicate with one of the three ports and to connect with one of the other two ports in each operative position of the valve, a water pan associated with said valve, and mechanism for oscillating said valve.

2; In reversing valve mechanism, the combination of a horizontal valve seat provided with three ports opening ,from below, a valve comprising a plate pivotally mounted to oscillate on and in contact with said seat and provided with a passage arranged in all positions of the valve to connect with'one of said portsv and in each of the two" positions of the valves to-'connect with one of the'other two of said ports, said plate projecting on either side of said valve so as to cover the third port in either operative position of the valve, and mechanism for oscillating said valve.` Y

3. In reversing valvemechanism, the combinationv of a flat horizontalV valve seat provided with a regenerator port, a gas port and avstack port, all opening frombelow, a plate `slidable on said valve seatl and pivoted to oscillate about the regenerator port, said plate carrying a member having a passage which at all times is in communication with the regenerator 'port and in 'the two operative positions of the valve is broughtinto communication with either the gas port or the stack port, said plate being of such size as to cover the third port in each position of the valve, and mechanism for oscillating said plate. Y

4t. In reversing valve mechanism, the combinationof a fiat horizontal valve seat-provided with a regeneratorport, a gas port4 and a 'stack port, all opening from below, a

Water pau slidable on said valve seat and pivoted to oscillate about the regenerator port, said pan carrying a member having a,

passage which at all ltimes is in communication With the regenerator port and in the two operative positions of the valve is brought into communication with either the gas port or the stack port, said pan being of such size as to cover the third port in each position of the Valve, and mechanism 10 for oscillating said pan.

In testimon7 whereof, I have hereunto set my hand.

HERMANN E. SCHILD. Witness:

ALICE A. TRILL. 

